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POPULAR SCIENCE REVIEW. 
Geysler’s glass tubes ; — the whole so disposed as to furnish a light sufficient 
for working, even where other lamps go out. [It is quite certain that 
where lamps go out the atmosphere is unfit for breathing ; nevertheless, it 
might be necessary to explore it temporarily.] The light produced does not 
heat the tube, and is inaccessible to the gas; there is consequently no danger 
of firing the explosive mixture outside. The whole apparatus is perfectly 
isolated ; it is as solid as the lamps now used ; gives off no noxious 
vapour, and may be relighted at any moment. It can act for at least 
twelve consecutive hours without diminution of light. 
ER MAJESTY has been graciously pleased to authorize the pre- 
sentation to each member of the London Photographic Society of a 
copy of the excellent photographic portrait of the late Prince Consort, 
taken by Mr. Vernon Heath. The Council have already taken steps to 
avail themselves of the privilege granted by the Queen, and will shortly 
be in a position to issue the requisite number of prints, which will be 
distributed to all subscribers for the current year. 
A faithful carte cle visite portrait of Mr. Hardwich has, to the extent of one 
hundred copies, been distributed, by Mr. St. George, amongst the members 
of the North London Photographic Society. 
As evidence of the appreciation of Photography, as a branch of the Fine 
Arts, it is satisfactory to notice the recent announcement of the Glasgow 
Art-Union. It has this year been decided to issue to the subscribers, 
instead of the usual guinea engraving, three large photographic repro- 
ductions from original paintings. The subjects respectively are — “ The 
Better Land,” by G. J. Sant, A.R.A. ; “ The White Cockade,” by J. E. 
Millais, A.R.A. ; and an illustration from Tennyson’s “Morte d’ Arthur,” 
by Noel Paton, R.S.A. The original paintings are intended for distri- 
bution, as prizes, and the reproductions, by Mr. Annan, of Glasgow, are 
in themselves first-rate examples of photographic art. 
The opinion we ventured to express in our last with regard to the causes 
of fading so lamentably manifest in the Gallery of Photographs lately 
forming part of the International Exhibition, has received a signal con- 
firmation from a specimen in the possession of Dr. Diamond, to which 
Mr. Malone took an opportunity of referring at a recent meeting of the 
London Photographic Society. The print in question was covered with 
the usual pasteboard mount and glass in front ; and although for several 
months it had been freely exposed to the light, had not suffered any apparent 
deterioration. On removing the print from its frame it was found, how- 
ever, to be very much faded in those parts which were obscured by the 
mounting-card, so that the oval figure of the latter was clearly discernible 
upon the face of the print ; and thus it appeared that exposure to the light 
and warmth of the sun had been directly instrumental in preserving the 
photograph from change, no doubt by aiding the evaporation of the hygro- 
scopic moisture from the central portion of the picture, and there maintain- 
ing a drier condition of surface than was possible in other parts which were 
PHOTOGRAPHY. 
